Deniable RSA Signature: The Raise and Fall of Ali Baba

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Billions of people now have conversations daily over the Internet. A large portion of this communication takes place via secure messaging protocols that offer "end-to-end encryption'" guarantees and resilience to compromise like the widely-used Double Ratc ...

The field of biometrics, and especially face recognition, has seen a wide-spread adoption the last few years, from access control on personal devices such as phones and laptops, to automated border controls such as in airports. The stakes are increasingly ...

Witness encryption is a cryptographic primitive which encrypts a message under an instance of an NP language and decrypts the ciphertext using a witness associated with that instance. In the current state of the art, most of the witness encryption construc ...

Morphing attacks are a threat to biometric systems where the biometric reference in an identity document can be altered. This form of attack presents an important issue in applications relying on identity documents such as border security or access control ...

We prove an identity relating the permanent of a rank 2 matrix and the determinants of its Hadamard powers. When viewed in the right way, the resulting formula looks strikingly similar to an identity of Carlitz and Levine, suggesting the possibility that t ...

Research on founder identity has significantly advanced our understanding of entrepreneurship and related literatures. By departing from the widely held-though often implicit-assumption that culture defines the parameters of identity formation, this paper ...

Messaging between two parties and in the group setting has enjoyed widespread attention both in practice, and, more recently, from the cryptographic community. One of the main challenges in the area is constructing secure (end-to- end encrypted) and effici ...

We give a construction of an efficient one-out-of-many proof system, in which a prover shows that he knows the pre-image for one element in a set, based on the hardness of lattice problems. The construction employs the recent zero-knowledge framework of Ly ...

We design a consecution of protocols which allows organizations to have secure strong access control of their users to their desktop machines based on biometry. It provides both strong secure authentication and privacy. Moreover, our mechanism allows the s ...

Time travel has always been a fascinating topic in literature and physics. In cryptography, one may wonder how to keep data confidential for some time. In this dissertation, we will study how to make private information travel to the future. This dissertat ...

Bluetooth (BR/EDR) is a pervasive technology for wireless communication used by billions of devices. The Bluetooth standard includes a legacy authentication procedure and a secure authentication procedure, allowing devices to authenticate to each other usi ...

We design a suite of protocols so that a small tamper-resistant device can be used as a biometric identity document which can be scanned by authorized terminals. We target both strongly secure identification and strong privacy. Unlike biometric passports, ...

The current trend towards personalized medicine creates an urgent need to share data among different hospitals and health institutions, which endangers the privacy of the data subjects if not done with the appropriate precautions. Conversely, the frequency ...

One of the core promises of blockchain technology is that of enabling trustworthy data dissemination in a trustless environment. What current blockchain systems deliver, however, is slow dissemination of public data, rendering blockchain technology unusabl ...

Trusted Execution Environments (TEEs), such as Intel SGX enclaves, use hardware to ensure the confidentiality and integrity of operations on sensitive data. While the technology is available on many processors, the complexity of its programming model and i ...

In our daily lives, people or devices frequently need to learn their location for many reasons as some services depend on the absolute location or the proximity. The outcomes of positioning systems can have critical effects e.g., on military, emergency. Th ...

The social demand for email end-to-end encryption is barely supported by mainstream service providers. Autocrypt is a new community -driven open specification for e-mail encryption that attempts to respond to this demand. In Autocrypt the encryption keys a ...

Precision mechanics: the buvette (pump room) of Évian-les-Bains is not just an architecture of great formal elegance, but above all an extraordinary technological object, a machine carefully calibrated, in equilibrium. Architectural criticism has largely d ...

Authenticated Encryption (AE) is a symmetric key cryptographic primitive that ensures confidentiality and authenticity of processed messages at the same time. The research of AE as a primitive in its own right started in 2000. The security goals of AE wer ...

The security of public-key cryptography relies on well-studied hard problems, problems for which we do not have efficient algorithms. Factorization and discrete logarithm are the two most known and used hard problems. Unfortunately, they can be easily solv ...

Deniable RSA Signature: The Raise and Fall of Ali Baba

Chattez avec Graph Search

On the Theory and Practice of Modern Secure Messaging

Performing and Detecting Backdoor Attacks on Face Recognition Algorithms

Extractable Witness Encryption for the Homogeneous Linear Equations Problem

Are GAN-based Morphs Threatening Face Recognition?

A Determinantal Identity for the Permanent of a Rank 2 Matrix

Identity-Society (Mis)Alignment And The Instrumentalization Of Firm Creation: Creative Destruction And Creative Reconstruction

Analysis and Improvements of the Sender Keys Protocol for Group Messaging

BLOOM: Bimodal Lattice One-out-of-Many Proofs and Applications

BioLocker: A Practical Biometric Authentication Mechanism based on 3D Fingervein

Time in cryptography

BIAS: Bluetooth Impersonation AttackS

BioID: a Privacy-Friendly Identity Document

MedChain: Accountable and Auditable Data Sharing in Distributed Medical Scenarios

Secure, Confidential Blockchains Providing High Throughput and Low Latency

Secured Routines: Language-based Construction of Trusted Execution Environments

Implications of Position in Cryptography

ClaimChain: Improving the Security and Privacy of In-band Key Distribution for Messaging

"Impossibile da calcolare!" Il cantiere della buvette di Évian-les-Bains, fra intuizione creativa e rigore intellettuale (M.Novarina, J.Prouvé, S.Ketoff, 1955-57)

Provably Secure Authenticated Encryption

LPN in Cryptography : an Algorithmic Study